Swift: skip QL code generation on untouched files

This is a developer QoL improvement, where running codegen will skip
writing (and especially formatting) any files that were not changed.

**Why?** While code generation in itself was pretty much instant, QL
formatting of generated code was starting to take a long time. This made
unconditionally running codegen quite annoying, for example before each
test run as part of an IDE workflow or as part of the pre-commit hook.

**How?** This was not completely straightforward as we could not work
with the contents of the file prior to code generation as that was
already post-processed by the QL formatting, so we had no chance of
comparing the output of template rendering with that. We therefore store
the hashes of the files _prior_ to QL formatting in a checked-in file
(`swift/ql/.generated.list`). We can therefore load those hashes at
the beginning of code generation, use them to compare the template
rendering output and update them in this special registry file.

**What else?** We also extend this mechanism to detect accidental
modification of generated files in a more robust way. Before this patch,
we were doing it with a rough regexp based heuristic. Now, we just store
the hashes of the files _after_ QL formatting in the same checked file,
so we can check that and stop generation if a generated file was
modified, or a stub was modified without removing the `// generated`
header.

.github/workflows/swift.yml

@@ -39,6 +39,7 @@ jobs:
               - 'swift/ql/lib/codeql/swift/elements/**'
               - 'swift/ql/lib/codeql/swift/generated/**'
               - 'swift/ql/test/extractor-tests/generated/**'
+              - 'swift/ql/.generated.list'
             ql:
               - 'github/workflows/swift.yml'
               - 'swift/**/*.ql'